Sony ICFCD-843-V Service manual

ICF-CD843V

SERVICE MANUAL

Ver 1.0 2004.02

SPECIFICATIONS

US Model

Model Name Using Similar Mechanism ICF-CD853V
Optical Pick-up Block Name KSM-213RDP
Optical Pick-up Name KSS-213R

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION
With 4−ohm loads, both channels driven from
100 − 10 000 Hz; rated 1.0 W per channel-minimum
RMS power, with no more than 10% total harmonic
distortion in AC operation.

CD player section

System: Compact disc digital audio system
Laser diode properties:

Material: GaAlAs
Wavelength: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 µW
(This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the optical pick-up block with 7 mm aperture.)

Frequency response: 20-20 000 Hz
Wow and flutter: Below measurable limit

+1

dB

−1.5

Radio section

Frequency range:

TV: 2 − 13 ch
WEATHER: 1 − 7 ch
FM: 87.5 − 108 MHz
AM: 530 − 1 710 kHz

General

Time display: 12-hour system
Speaker: 66 mm (2
Power outputs:

1.2 W + 1.2 W (at 10% harmonic distortion)

Power requirements: 120 V AC, 60 Hz
Dimensions:

Approx. 185.5 × 176 × 210.5 mm (w/h/d)
(Approx. 7
projecting parts and controls

Mass: Approx. 1 780 g (3 lb 15

Design and specifications are subject to change
without notice.

5

/

8

inches) dia., 4

3

/8 × 7 × 8 3/8 inches) incl.

oz)

TV/WEATHER/FM/AM CD CLOCK RADIO

9-877-625-01 Sony Corporation

2004B05-1 Personal Audio Company
C 2004.02 Published by Sony Engineering Corporation

ICF-CD843V

TABLE OF CONTENTS

1. SERVICING NOTES .............................................. 3

2. GENERAL .................................................................. 4

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 5

3-2. Rear Cabinet Assy........................................................... 6

3-3. CD Lid ............................................................................. 6

3-4. Upper Cabinet Assy ........................................................ 7

3-5. MAIN Board ................................................................... 7

3-6. CD Block......................................................................... 8

3-7. Optical Pick-up (KSS-213R) .......................................... 8

4. ELECTRICAL ADJUSTMENTS

Tuner Section ................................................................. 9

CD Section ..................................................................... 11

5. DIAGRAMS

5-1. Block Diagram – CD Section – .................................... 12

5-2. Block Diagram – MAIN Section – ............................... 13

5-3. Note for Printed Wiring Board and

Schematic Diagrams ....................................................... 14

5-4. Printed Wiring Board – CD Section – .......................... 16

5-5. Schematic Diagram – CD Section – ............................. 17

5-6. Printed Wiring Board – MAIN Section – ..................... 18

5-7. Printed Wiring Boards – POWER Section – ................ 19

5-8. Schematic Diagram – MAIN section (1/2) – ............... 20

5-9. Schematic Diagram – MAIN section (2/2) – ............... 21

5-10. Printed Wiring Boards – PANEL Section – ................. 22

5-11. Schematic Diagram – PANEL Section – ...................... 23

6. EXPLODED VIEWS

6-1. Cabinet Section ............................................................... 27

6-2. Upper Cabinet Section .................................................... 28

6-3. Front Cabinet Section ..................................................... 29

6-4. Rear Cabinet Section ...................................................... 30

6-5. Optical Pick-up Section (KSM-213RDP) ...................... 31

7. ELECTRICAL PARTS LIST .............................. 32

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow­ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter . The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica­tion is 0.75 V, so analog meters must have an accurate low­voltage scale. The Simpson 250 and Sanwa SH-63T rd are e x­amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit­able. (See Fig. A)

To Exposed Metal
Parts on Set

1.5 k

0.15 µF

Fig. A. Using an AC voltmeter to check AC leakage.

Ω

Earth Ground

AC
voltmeter
(0.75 V)

Notes on chip component replacement

•Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270 ˚C dur­ing repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering
or unsoldering.

2

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra­diation exposure.

About CD-Rs/CD-RWs

This unit is compatible with CD-Rs/CD-RWs but
playback capability may vary depending on the
quality of the disc, the recording device and
application software.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

SECTION 1

SER VICING NOTES

ICF-CD843V

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro­static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis­sion, observe from more than 30 cm away from the objectiv e lens.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S302. (push switch type)
The following checking method for the laser diode is operable.

• Method
Emission of the laser diode is visually checked.

1. Open the upper lid.

2. Push the S302 as shown in Fig.1.

Note: Do not push the detection lever strongly, or it may be bent or dam-

aged.

3. Press the CD u button.

4. Check the object lens for confirming normal emission of the

laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
In this operation, the object lens will move up and down 2
times along with inward motion for the focus search.

CHUCK PLATE JIG ON REPAIRING

On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.

• Code number of Chuck Plate Jig: X-4918-255-1

S302

Fig.1 Method to push the S302

3

ICF-CD843V

SECTION 2

GENERAL

This section is extracted from
instruction manual.

Features

• TV/WEATHER/FM/AM 4 band PLL (phase locked

loop) synthesized clock radio

• Easy preset digital tuning with 25 memory presets

• Built-in CD player with CD-R/RW playback

function

• Easy to see large Display with small footprint.

•Triple Alarm (Radio, buzzer or CD) with the

extendable snooze function.

• Easy nap timer —one push operation.

• LCD with backlight which has a brightness control

switch.

•D.S.T. (Daylight Saving Time) −Summer time

calculation.

Setting the Brightness
of the Backlight

Press BRIGHTNESS to select high, middle or low for
the display according to your preference.

Setting the Clock
and Date

1

Plug in the clock radio.

The display will flash AM 12:00 .

2

Press CLOCK for a few seconds.

You will hear a beep and the year will start to
flash in the display.

3

Press TUNE/TIME SET + or until the
correct year appears in the display.

4

Press CLOCK once.

5

Repeat steps 3 and 4 to set the month, day,
hour, and minute.

After setting the minutes, press CLOCK to start
the clock, and you will hear two short beeps.

To display the year and date, press
SNOOZE•DATE/SLEEP OFF once for the date,
and within 4 seconds press it again for the year. The
display shows the date or year for a few seconds and
then changes back to the current time.

To set the current time rapidly, hold down
TUNE/TIME SET + or

In step 5, when you press CLOCK after the minute
setting to activate the clock, the seconds start counting
from zero.

.

The PRESET TUNING 3 button has a
tactile dot.

FM wire
antenna

AC power
cord

The CD u button has a tactile dot.

To change the display to the
daylight saving time (summer time) indication

Press D.S.T./SUMMER T.

summer time.
To deactivate the summer time function, press
D.S.T./SUMMER T. again.

Setting the Alarm

This clock radio is equipped with 3 alarm modes−
CD, radio and buzzer. Before setting the alarm, make
sure to set the clock (see Setting the Clock and
Date ).

There is a tactile dot
beside volume to show
the direction to turn up
the volume.

is displayed and the time indication changes to

To Set the Alarm Time

To Set the CD Alarm:

For the CD alarm, the track you specified as the
Wake-up track is played first.
(If the CD play mode is set to SHUFFLE or

SHUFFLE REP , however, all the tracks are played

in random order.)

1

With the alarm turned on, adjust the volume
to the level you require.

2

Press ALARM SET CD for a few seconds.

ALARM , CD appear on the display.
After one beep, ALARM and the hour will start
to flash in the display.

3

Press TUNE/TIME SET + or until the
desired hour appears.

To set the hour rapidly, hold down TUNE/TIME
SET + or

4

Press ALARM SET CD.

The minute will flash.

5

Repeat step 3 to set the minute and press
ALARM SET CD.

The wake-up track number flashes on the display.

6

Press TUNE/TIME SET + or to select
the desired wake-up track number.

The wake-up track number can be set up to 99.

7

Press ALARM SET CD.

Two short beeps will confirm the setting.

To Set the Radio Alarm:

For the radio alarm, the station you specified as the
Wake-up station is played.

1

Tune into a station and adjust the volume.

2

Press ALARM SET RADIO for a few
seconds.

ALARM and RADIO appear on the display.
After one beep, ALARM and the hour will start
to flash on the display.

3

Press TUNE/TIME SET + or until the
desired hour appears.

To set the hour rapidly, hold down TUNE/TIME
SET + or

4

Press ALARM SET RADIO.

The minute will flash.

5

Repeat step 3 to set the minute and press
ALARM SET RADIO.

WAKE UP STA appears and the preset number

flashes on the display.

6

Press TUNE/TIME SET + or to select
the wake-up station.

Preset number changes in the order as follows:

You can directly select the desired wake-up
station by pressing RADIO•BAND or the
PRESET TUNING button while the indication

7

Press ALARM SET RADIO.

Two short beeps will confirm the setting.

AM P1 to 5 FM1 P1 to 5

P

P1 to 5

P− is the last received station.

P− is not displayed.

FM2 P1 to 5TV P1 to 5WEATHER

To Set the Buzzer Alarm:

1

Press ALARM SET BUZZER for a few
seconds.

ALARM and BUZZER appear on the display.

After one beep, ALARM and the hour will start
to flash on the display.

2

Press TUNE/TIME SET + or until the
desired hour appears.

To set the hour rapidly, hold down TUNE/TIME
SET + or

3

Press ALARM SET BUZZER.

The minute will flash.

4

Repeat step 2 to set the minute and press
ALARM SET BUZZER.

Two short beeps will confirm the setting.

To Set the Alarm Mode

Before setting the alarm mode, be sure to set the alarm
time. (See To Set the Alarm Time .)
Repeat the pressing of ALARM MODE to select the
alarm mode you want. Every time you press ALARM
MODE, CD/RADIO/BUZZER indicator changes in
the order as follows:

The alarm time which plays or sounds next is
displayed.

To Check the Alarm Setting

For ALARM SET CD, pressing once displays the
alarm time, pressing twice displays the wake-up track
number.
For ALARM SET RADIO, pressing once displays
the alarm time, pressing twice displays the wake-up
station.
For ALARM SET BUZZER, pressing once displays
the alarm time.
The display shows the alarm setting for a few seconds
and then returns to the previous display.

Alarm time in CD alarm, radio alarm and buzzer
alarm is set at AM 12:00 when you purchased the
unit.

ALARM ON—

If you set the CD alarm and there is no disc in the CD
player, the buzzer alarm will sound in its place at the
time set.

For the buzzer alarm, the beeping of the alarm
becomes more rapid after every few seconds in three
progressive stages.

Note

When CD, radio and buzzer alarms are set for the
same time, the CD alarm takes precedence. If the CD
alarm is not set, the radio alarm takes precedence.

To Doze for a Few More Minutes

Press SNOOZE•DATE/SLEEP OFF.
The CD, radio or buzzer alarm turns off but will be
automatically activated again after about 10 minutes.
Every time you press SNOOZE•DATE/SLEEP
OFF, the snooze time changes as follows:

CD

RADIO

BUZZER

CD+RADIO

OFF

CD+BUZZER

RADIO+BUZZER

CD+RADIO+BUZZER

20

10

40

30

60

50

The display shows the snooze time for a few seconds
and returns to show the current time. When you press
SNOOZE•DATE/SLEEP OFF after the current time
appears, the snooze time starts from 10 minutes again.

The maximum length of the snooze time is 60
minutes.

ALARM OFF—

The CD, radio, or buzzer alarm is turned off
automatically after 60 minutes.

To Stop the Alarm

Press OFF x•ALARM RESET to turn off the alarm.
The alarm will come on again at the same time the
next day.

To Deactive the Alarm

Press ALARM MODE repeatedly until CD/RADIO/
BUZZER indicator go off.

Setting the Sleep
Timer

You can fall asleep to the CD or the radio using the

automatically after a preset duration.
Press SLEEP during CD or radio play.

You can set the sleep timer to durations of 90, 60, 30,
or 15 minutes. Every push changes the display as
follows:

off (current time)

SLEEP will appear in the display when the duration
time is set.
The CD or the radio will play for the time you set,
then shut off.

To turn off the CD or the radio before the preset time,
press SNOOZE•DATE/SLEEP OFF.

90

60

15

30

4

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET

3-2. Rear Cabinet Assy

(Page 6)

ICF-CD843V

SECTION 3

DISASSEMBLY

3-4. Upper Cabinet Assy

(Page 7)

3-5. MAIN Board

(Page 7)

3-6. CD Block

(Page 8)

3-7. Optical Pick-up

(KSS-213R)
(Page 8)

3-3. CD Lid

(Page 6)

5

ICF-CD843V

)

)

Note: Follow the disassembly procedure in the numerical order given.

3-2. REAR CABINET ASSY

5

connector (CN901)

4

3

two screws (B3)

6

rear cabinet assy

3

two screws (B3)

2

two screws (B2.6

3-3. CD LID

1

two screws (B2.6)

4

CD lid

3

boss

3

boss

2

damper

1

6

screw (B3

3-4. UPPER CABINET ASSY

y

s

1

screw (B2.6)

4

flexible flat cable (20core)
(CN301)

2

two screws (B3)

3

1

screw (B2.6)

5

upper cabinet ass

ICF-CD843V

3-5. MAIN BOARD

1

flexible flat cable (14core)
(CN302)

3

MAIN board

2

screw (B3)

2

four screw
(B3)

7

ICF-CD843V

)

3-6. CD BLOCK

3

vibration proof (green)

2

3

vibration proof (green)

1

screw (B2.6)

4

CD block

3-7. OPTICAL PICK-UP

(KSS-213R)

1

three screws
(B2.6)

3

gear (B)

two claws

1

8

optical pick-up (KSS-213R)

3

vibration proof (red)

3

vibration proof (red

2

CD cover

1

two claws

5

6

sled shaft

4

two screws (M2)

7

flexible flat cable (16core) (CNP701)

8

SECTION 4

ELECTRICAL ADJUSTMENTS

ICF-CD843V

TUNER SECTION 0 dB=1 µV

[AM]

Setting:

Function : RADIO
RADIO BAND button : AM

MAIN board

AM RF signal

generator

30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible

Put the lead-wire
antenna close to
the set.

MAIN board

TP (VT)

TP (FM GND)

set

100 k

[FM/TV]

Setting:

Function : RADIO
RADIO BAND button: FM or TV or WEATHER

CN303 pin

4.0

Ω

MAIN board
CN303 pin

digital voltmeter

Ω

4

level meter

+
–

3

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L5 580 kHz

CT1 1,490 kHz

FM/TV (2 – 6 CH) VCO VOLTAGE CONFIRMATION

Adjustment Part Frequency Display Reading on Digital Voltmeter

Confirmation 108 MHz 15.0 ± 1.0 V
Confirmation TV 2 ch 2.35 ± 0.1 V

FM/TV (2 – 6 CH) TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L2 TV 2 ch

CT2 108 MHz

TV (7 – 13 CH), WEATHER (1 – 7 CH)

VCO VOLTA GE CONFIRMATION

Adjustment Part Frequency Display Reading on Digital Voltmeter

Confirmation TV 13 ch 10.0 ± 1.0 V
Confirmation WEATHER 2 ch 4.6 ± 0.5 V

TV (7 – 13 CH), WEATHER (1 – 7 CH)

TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L3 WEATHER 2 ch

CT3 TV 13 ch

MAIN board

FM RF signal

generator

0.01 µF

22.5 kHz frequency
deviation by 400 Hz
signal
Output level:
as low as possible

MAIN board

TP (AM GND)

MAIN board
TP (ANT)

MAIN board
TP (FM GND)

TP (VT)

set

digital voltmeter

Ω

100 k

CN303 pin

4.0

MAIN board
CN303 pin

4

level meter

Ω

+
–

3

•Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca­pacitors.

• Remove FM antenna in FM adjustment.

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

RV2 1,000 kHz

Adjustment Location: MAIN board (See page 10)

FM STEREO ADJUSTMENT

Setting:

Function: RADIO
RADIO BAND button: FM

FM RF SSG

µ

F

0.01

Carrier frequency : 87.5 MHz
Modulation : no modulation
Output level : 0.1 V (100 dB)

MAIN board
TP (ANT)

set

MAIN board
TP (FM GND)

1. Connect the frequency counter to TP (FMST) and TP (RA­DIO +B) as shown the figure below.

2. Tune the set to 87.5 MHz.

3. Adjust RV1 for 75.95 to 76.05 kHz reading on the frequency
counter.

frequency counter

MAIN board

TP (FMST)

TP (RADIO +B)

TP (FM GND)

1

33 k

µ

F/50 V

+

+
–

Ω

AM VCO VOLTA GE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L1 530 kHz 2.3 ± 0.05 V

Confirmation 1,710 kHz 8.7 ± 1.0 V

Adjustment Location: MAIN board (See page 10)

9

ICF-CD843V

Adjustment Location:

– MAIN BOARD (Component Side) –

L5

AM T rac king Adjustment

}

CT1

L1 AM VCO Voltage Adjustment

L3 TV (7 – 13 ch)/Weather (1 – 7 ch)
CT3 }Tracking Adjustment

RV2 AM IF Adjustment

CT2

FM/TV (2 – 6 ch) Tracking Adjustment

}

L2

RV1 FM Stereo Adjustment

– MAIN BOARD (Conductor Side) –

TP

(AM GND)

TP

(RADIO +B)

TP

(FM GND)

TP

(ANT)

TP

(VT)

10

CD SECTION

CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.

FOCUS BIAS CHECK

1. Connect the oscilloscope to TP (RF) and TP (GND) on the CD
board.

2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)

3. Press the u (CD) button.

4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the
center of the waveform can be clearly distinguished.

• RF signal reference waveform (eye pattern)

VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns

0.8

±

0.2 Vp-p

ICF-CD843V

When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.

Adjustment Location:

– CD BOARD (Conductor Side) –

IC701

TP (GND)

TP

(RF)

1111

ICF-CD843V

5-1. BLOCK DIAGRAM – CD Section –

SECTION 5

DIAGRAMS

DETECTOR

A

D

C

B

F

E

OPTICAL PICK-UP

(KSS-213R)

LASER DIODE

PD

LD

I-V AMP

RF AMP, FOCUS/TRACKING SERVO,

DIGITAL SIGNAL PROCESSOR,

CLV SERVO, D/A CONVERTER

A

D

C

B

F

E

LD

AUTOMATIC

POWER

CONTROL

Q701

FIN2

8

FIN1

7

TIN2

10

TIN1

9

LDD

80

TBAL

APC

LPF

+

MIX

LPF

AUDIO

ADJUST

LDS

79

TE

13FE15

IC701

EFM

RF

EQ

AGC

SW

TRACK

JUMP

S/H

TDO21FDO23SLDO22SPDO

20

4

PH

BH

A/D

GENERAL-PURPOSE

CONT4

25

3

PORTS

D/A

IN

SLISE LEVEL

CONTROL

RUPTURE

DETECT

SERVO

PROCESSOR

SW

CONT1

72

RAM

ERROR

CORRECTION

AUDIO CD

C1 – 2, C2 – 2

XIN

49 48

RAM

XOUT

INTERPOLATION

MUTE

ATTENUATION

DEEMPHASIS

CLV, CAV
CONTROL

RES

66

8FS

DIGITAL

FILTER

PLL

VCEC

COMMAND
INTERFACE

61CE62CL63DI64DO65

1 BIT

DAC

AUDIO

OUT

PROTECT INSERT,

WRQ

FRAME SYNC

DETECT,

EFM DECODE

DRF

LPF

LCHO
RCHO

DOUT

FSEQ

DRF

42

R-CH

45

39

31

67

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: CD PLAY

41 FSEQ

57 DRF

SYSTEM

CONTROLLER

IC401 (1/2)

CD-L

A

(Page 13)

2-AXIS

DEVICE

(FOCUS)

PD

T+

T–

(TRACKING)

F+

1

F–

M702

(SLED)

M701

(SPINDLE)

S701

(LIMIT)

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

T+

12

T–

11

F+

17

F–

18

SL+

M

M

26

SL–

27

SP+

2

SP–

1

IC702

TRACKING

COIL DRIVE

FOCUS

COIL DRIVE

SLED

MOTOR DRIVE

SPINDLE

MOTOR DRIVE

TIN

FIN

SLIN

SPIN

9

19

25

3

7MUTE

X701

33.8688MHz

D306

D307

D308

D52

DI

D53

CLK

CE

D54

S302

CD LID OPEN/CLOSE

DETECT

50 WRQ

56 DATA-IN CD

54 DATA CD/RADIO

55 CLK CD/RADIO

53 LAT CD/RADIO

58 XRST

OPEN

39

DI, CLK, CE

B

(Page 13)

1212